I experimented with it yesterday. The Hot Apple Pie from Candlewic and the Strawberry from Candles and Supplies both smoked in the tealight burner when I only had one cube in it. When I added an additional cube, it stopped. I think the melt pool was too low, therefore getting too hot. ?? When I added more wax, I didn't see it anymore. I did try to get a temp reading on it, and it didn't get past 145F.
I didn't see the "smoking" issue in the exact same scents on my electric plate warmer, so it's gotta be the tealight burner with minimal wax combo.